Battery charger



FIG. 1 is a perspective view of a battery charger showing our new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevation thereof.

The broken lines in the figures represent portions of the article which form no part of the claim. 

CLAIM The ornamental design for a battery charger, as shown and described. 